Why does this topic matter?

When does damage happen?
                                                    Root damage on red oak leading to stem failure

How do these acts hurt the tree? How can the roots be protected? Where can I get more information?

ISA.  1999.  "Avoiding Tree Damage During Construction"  Champaign IL: International Society of Arboriculture.  For other information, advice and help on this topic, call offices of your State Urban Forestry Coordinator or University Extension service, or visit urban forestry websites.